Gnarsh is the matriarch of an unknown Rock Troll clan. The Tuatha Deohn enhanced her with vast amounts of Prismere, driving her insane. The Weave of Fate said that with the support of the Tuatha, Gnarsh was fated to rampage across the Dalentarth.

It is advised to stay cautious when fighting Gnarsh as she has a very large amount of health and does massive damage. It is recommended to use a Greatsword or Chakrams to reduce her to 50% of her initial health, then Fateshift Gnarsh during Reckoning to eliminate her.